Knowledgebase
European Crane Fly Control in Lawn #856664
Asked December 26, 2023, 4:29 PM EST
Washington County Oregon
Expert Response
This publication covers pest biology and management strategies, answering the questions you have raised above and listing the insecticides that are effective for European crane fly control for home lawn use and restricted use. It was unclear whether you hired a professional to control or did it yourself. Various insecticide chemistries work differently- some products are ovicidal, and some are larvicidal. No control for adult flies is recommended. Spring application is recommended for targeting larvae using either contact or systemic insecticides, and fall application prior to egg hatch might suppress further damage.
Larvae hatch in late summer (Aug.-Sept.) and feed through winter and into spring, causing the most damage in the spring (April and May). This pest overwinters as a third-instar larva in the soil. Adult emergence may begin anytime from July to mid-October. Adult males are 14 to 19 mm in length, and adult females are 19 to 25 mm long. Adult crane flies do not feed-they only drink water-and their life expectancy is 2 to 14 days. They usually mate and lay eggs within 24 hours of emergence. Eggs are laid in turfgrass. Eggs and early instar larvae require a very moist atmosphere or high mortality will occur; therefore, populations are greatest in turfgrass adjacent to saturated soils. Eggs hatch in approximately 11 to 15 days. The young larvae develop rapidly through to the third instar, known as leatherjackets, in which state they overwinter. At this stage, the larvae feed on the turfgrass through the winter months into the spring, causing the most damage in April and May.
For more details on suggested
insecticides and specific usage rates, refer to the Pacific
Northwest Insect Management Handbook (https://
pnwhandbooks.org/insect) and the insecticide label.
https://pnwhandbooks.org/insect/hort/turfgrass/turfgrass-crane-fly
The key to preventing crane flies is maintaining healthy turfgrass. Follow Practical Lawn Care for Western Oregon, EC 152, https://catalog.extension.oregonstate.edu/ec1521
I hope all of this is helpful.
Please send samples to the OSU plant clinic for further queries. Thanks,
Navneet